Worldsheet Realization of the Refined Topological String

A worldsheet realization of the refined topological string is proposed in terms of physical string amplitudes that compute generalized N=2 F-terms of the form F_{g,n} W^{2g}Y^{2n} in the effective supergravity action. These terms involve the chiral Weyl superfield W and a superfield Y defined as an N=2 chiral projection of a particular anti-chiral T-bar vector multiplet. In Heterotic and Type I theories, obtained upon compactification on the six-dimensional manifold K3xT2, T is the usual K\"ahler modulus of the T2 torus. These amplitudes are computed exactly at the one-loop level in string theory. They are shown to reproduce the correct perturbative part of the Nekrasov partition function in the field theory limit when expanded around an SU(2) enhancement point of the string moduli space. The two deformation parameters epsilon_- and epsilon_+ of the Omega-supergravity background are then identified with the constant field-strength backgrounds for the anti-self-dual graviphoton and self-dual gauge field of the T-bar vector multiplet, respectively.Comment: 35 pages, typos corrected, published in NP

Pengaruh Pupuk Organik Cair Terhadap Pertumbuhan Kedelai (Glycine Max (L.) Merr) Pada Tanah Podzolik Merah Kuning

The research of the effect of liquid organic fertilizer to the soybean growth on podzolik merah kuning soil has been held. The aim of the research is to know the effect of fluid organic fertilizer to he growth of soybean on podzolik merah kuning soil. This research is complete randomized design (RAL) about this research in 6 treatment and 4 repetation. Those are A = 0 ml/polibag, B = 60 ml/polibag, C = 120 ml/polibag, D = 180 ml/polibag, E = 260 ml/polibag, F = 300 ml/polibag. The data is analyzed by various investigation and continued test with DMRT. The result of research shows that it's giving the positive effect of soil's pH, the plant's heigh, plants aged 7, 14, 21, 28, nd 35 days number of leaves, total wet weight's plant, dried weight's plant and number of nodule of these plants shows positive effect of the soybean's growth

Spectrally Efficient FDM System with Probabilistic Shaping

This work proposes and explores the use of probabilistic shaping for the non-orthogonal multicarrier spectrally efficient frequency division multiplexing (SEFDM) system. The system design considers the reverse concatenation architecture which cascades the constant composition distribution matching (CCDM) algorithm together with soft-decision forward error correction (SD-FEC)-LDPC code for the probabilistic shaping scheme. The non-orthogonal signalling is implemented by discrete Fourier transform (DFT)-based SEFDM modulation with matched filtering demodulation and advanced interference cancellation detection. The high achievable spectral efficiency, low computation complexity and reliability make SEFDM a good candidate for multicarrier signalling for beyond 5G communications. By adding extra shaping gain and flexibility of rate adaptation, the combination of two capacity-achieving techniques provides significant insight of further performance improvement. In this paper, we investigate the performance of the proposed probabilistically shaped-SEFDM (PS-SEFDM) system with regular QAM constellations. The presented results of the proposed system show less required power and bandwidth saving compared to OFDM when achieving the same error performance and same spectral efficiency

Probabilistic Shaping for Multidimensional Signals with Autoencoder-based End-to-end Learning

This work proposes a system that optimises multidimensional signal transmission, utilising signals with probabilistic shaping designed with the aid of end-to-end learning of an autoencoder-based architecture. For the first time, this work reports bit mapping optimisation for multidimensional signals and applied the newly derived optimised signals to the probabilistic shaping system. The autoencoder employs two neural networks for the transceiver, separated by the embedded channel. The optimisation of the autoencoder configuration is implemented for probabilistic shaping for n-dimensional signals. Specifically, We investigate a 4-dimensional (4D) signal employing 2 successive time slots that has better noise immunity relative to regular 2-dimensional quadrature amplitude modulation (QAM) signals. We propose a new application of autoencoders in communication systems based on 4D signals and apply machine learning to optimise the 4D probabilistic shaping on the basis of receiver signal-to-noise-ratio (SNR). The performance of the optimised probabilistically shaped 4D signals is evaluated in terms of the bit error rate (BER) and mutual information. Simulation results show that the proposed probabilistically shaped 4D signal achieves better BER performance relative to the unshaped 4D and regular 2D QAM. We demonstrate the mutual information of the proposed signal with varying SNR, showing its improved capacity in comparison with other constellations

Zero Trust Architecture: A Comprehensive Approach to Incident Response Management

Zero Trust Architecture is a modern security strategy that is based on the principle of “never trust, always verify”. This approach to security eliminates trust from an organization’s network architecture and focuses on managing enterprise risk management practice throughout the four phases: identification, assessment, response, and monitoring and reporting. Incident response refers to an organization’s processes and technologies for detecting and responding to cyberthreats, security breaches or cyberattacks. An effective incident response plan can help cybersecurity teams detect and contain cyberthreats and restore affected systems faster, reducing the lost revenue, regulatory fines and other costs associated with these threats. Zero Trust architecture can be aligned with the four general categories of risk response strategies: tolerate, operate, monitor, and improve. By design, telemetry, state information, and risk assessment from threat protection feed into the Zero Trust policy engine to enable automatic response to threats. In this paper, we present a comprehensive approach to incident response management using Zero Trust Architecture. We discuss the key principles of Zero Trust Architecture and how it can be applied to incident response management to improve an organization’s overall security posture

Analisis Pentingnya Kecepatan Internet dengan Keamanan Siber

Peran internet dalam mendukung berbagai aspek kehidupan di era digital menjadi sangat krusial. Hal tersebut menjadi alasan kuat untuk memperhatikan kecepatan internet dan keamanan siber. Meski begitu, kesenjangan antara kecepatan internet dengan keamanan siber di Indonesia masih ada. Minimnya pemerataan pembangunan wilayah membuat sebagian besar wilayah Indonesia memiliki keterbatasan kecepatan internet dan persepsi kemanan siber yang rendah . Penelitian dilakukan untuk menyajikan analisis mendalam tentang urgensi peningkatan kecepatan internet seiring dengan penguatan upaya perlindungan terhadap keamanan siber, serta implikasinya terhadap masyarakat Indonesia yang semakin terhubung secara digital. Metode penelitian yang digunakan adalah regresi linear untuk menganalisis hubungan sebab-akibat antara kecepatan internet dan GCI ranking. Hasil penelitian memperlihatkan bahwa kecepatan internet (dinyatakan dalam Mbps) mempengaruhi  perubahan Global Cybersecurity Index (GCI) ranking sebesar 12,7%

Efektivitas Model Belajar “Demonstrasi Interaktif Berbasis Inkuiri” Dalam Meningkatkan Kemampuan Berpikir Analitik Dan Kreatif Mahasiswa Teknik Konversi Energi Politeknik

: Research aims to determine the effectiveness of the model DIBI (InquiryBased Interactive Demonstration) in improving the analytic and creative abilities of students. Test the effectiveness of the quasi - experimental methods. The results of the study are: Characteristics DIBI models strongly support the effectiveness of implementation in the field ; Improved thinking skills class and a class experiment 35% control 15% ; Model DIBI improve organizing, attributing, defferentiating, generating, planning, and constructing a row: 37 % , 31 % , 27 % , 52 % , 23 % and 18 % ; Improved analytical capabilities (creative) as a model in the group ‘s ability DIBI low, medium and high respectively : 39 % (32%), 31% (48%) ; and 28% (37%) , and correlation coefficient (determination) between the increased ability to think with a score of UTS low ability groups, medium, and high, respectively : 0.419 (17.5%) ,0,105(1 .1%) and 0,580 (33.7%)

In-vitro anticancer activity against Caco-2 cell line of colloidal nano silver synthesized using aqueous extract of Eucalyptus Camaldulensis leaves

In the current study, we investigated the anticancer potential against human colon cells (Caco-2) of colloidal nanosilver (CN–Ag) produced in Syria using bioactive compounds in the aqueous extract of Eucalyptus camaldulensis leaves (AEECL). The formation of AgNPs was confirmed by UV-visible spectroscopy analysis with surface plasmon peak at 449 nm and their average size was found to be 12, 10, 23 nm by SEM, DLS and NTA respectively. This small size has confirmed the effective role of AEECL as capping agent. Further morphological characterization was done by EDS showed the presence of metallic silver. Zeta potential value (-23 mV) indicated the repulsion among the particles and stability of the formulation nanosilver. The anticancer effect of synthesized CN–Ag against Caco-2 has been tested. The cytotoxicity assay showed a dose-dependent and a time-dependent effect of CN–Ag. The high cytotoxicity of CN–Ag at low concentration (5μ/mL) open new prospects for the development of novel therapeutic approaches against human colon cancer Caco-2